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THE NEW TECHNOLOGY OF THE ANODIC OXIDATION APPLIED TO AZ91D ALLOY |
Henan Wang;Hongwei Huo;Ying Li |
中科院金属所 |
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Abstract A suitable mixture without chromium is developed for protection of mag nesium alloys by treatment with the anodic oxidation.The aqueous solution is co mposed of NaOH、Na2SiF6 and an organic additive.The potentiodynamic polariza tio n measurement showed that the film had outstanding protective ability in 3.5% Na Cl solution.The morphology and component of the anodic oxidation film have been analysed by SEM,XRD,XPS and EPMA respectively.XRD and EPMA analysis revealed that the film was made of MgO、MgAl2O4 and 2Al2O3·2SiO2·H2O.Si and Al oxides make up the volume shrinkage of magnesium oxides,so that the film has no crack which provides a good condition against pitting.And the even dispersio ns of Si and Al in the film is another factor that the film has better protectio n.
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Received: 17 May 2002
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Corresponding Authors:
Henan Wang
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